Backlight module and display device

Abstract

The present application discloses a backlight module and a display device, and relates to the field of display technology. The backlight module includes a lamp board, and a plurality of light-emitting units are arranged at intervals on the lamp board. The backlight module also includes a diffusion plate, and the diffusion plate is arranged on the light-emitting surface side of the lamp board corresponding to the position of the lamp board. The diffusion plate includes a plurality of baffles and a plane portion, and the plane portion is arranged parallel to the lamp board. A plurality of baffles are arranged at intervals on the side of the plane portion close to the lamp board, and the baffles are perpendicular to the plane portion. The height of the baffles is equal to the distance between the plane portion and the lamp board, and each baffle is arranged corresponding to the gap between two adjacent light-emitting units; the baffles include a reflective portion and a translucent portion, and one side of the translucent portion is connected to the plane portion, and the other side is connected to one side of the reflective portion, and the other side of the reflective portion abuts against the lamp board; the height of the translucent portion is less than the height of the reflective portion. The present application improves the problem of light loss in the luminous area caused by the diffusion of light from the luminous area of ​​the lamp board to the non-luminous area by the above method.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] The current Mini LED backlight can greatly improve the display quality and is comparable to OLED in terms of wide color gamut, ultra-high contrast, and HDR display. At the same time, its price has outstanding advantages over OLED of the same size, with a higher cost-effectiveness and huge development potential.

[0003] However, since the Mini LED backlight uses zone dimming technology, the multiple light-emitting units on the light board are in a working state to form a light-emitting area, and some are in a non-working state to form a non-light-emitting area according to actual needs. Since the working light-emitting units and the non-working light-emitting units are close to each other, the light in the light-emitting area will diffuse to the non-light-emitting area, resulting in light loss in the light-emitting area, affecting the picture display effect.

[0004] Therefore, how to improve the light loss in the luminous area caused by the light from the luminous area of ​​the light board diffusing to the non-luminous area has become a problem that needs to be solved urgently in this field. Summary of the invention

[0005] The purpose of the present application is to provide a backlight module and a display device to improve the problem of light loss in the luminous area due to the diffusion of light from the luminous area of ​​the light board to the non-luminous area.

[0006] The present application discloses a backlight module, comprising a light board, on which a plurality of light-emitting units are arranged at intervals, the backlight module also comprising a diffusion plate, the diffusion plate being arranged on the light-emitting surface side of the light board corresponding to the position of the light board, the diffusion plate comprising a plurality of baffle walls and a plane portion, the plane portion being arranged parallel to the light board, a plurality of the baffle walls being arranged at intervals on a side of the plane portion close to the light board, the baffle walls being perpendicular to the plane portion, the height of the baffle walls being equal to the distance between the plane portion and the light board, and each of the baffle walls being arranged corresponding to the gap between two adjacent light-emitting units; the baffle wall comprising a reflective portion and a light-transmitting portion, one side of the light-transmitting portion being connected to the plane portion, the other side being connected to one side of the reflective portion, and the other side of the reflective portion being in contact with the light board; the height of the light-transmitting portion is less than the height of the reflective portion.

[0007] Optionally, the reflective portion is made of reflective material, and a height of the reflective portion is less than a distance between the planar portion and the light board, and is greater than or equal to two-thirds of the distance between the planar portion and the light board.

[0008] Optionally, the width of the light-transmitting portion in the horizontal direction is smaller than the width of the reflecting portion in the horizontal direction; a plurality of prism structures are arranged at a position of the planar portion corresponding to the reflecting portion, the plurality of prism structures are respectively located on both sides of the light-transmitting portion, and the total width of the plurality of prism structures and the light-transmitting portion in the horizontal direction is less than or equal to the width of the reflecting portion in the horizontal direction.

[0009] Optionally, the reflecting part is made of a transparent material, and the outer side surface of the reflecting part is covered with a reflecting layer. The light board also includes a plurality of auxiliary light-emitting units, and the auxiliary light-emitting unit is arranged between two adjacent light-emitting units, and the auxiliary light-emitting unit corresponds to the position of the reflecting part; a receiving groove is provided on one side of the reflecting part close to the light board, and the auxiliary light-emitting unit is embedded in the receiving groove.

[0010] Optionally, the light-transmitting portion includes a first light-transmitting portion and a second light-transmitting portion, the first light-transmitting portion and the second light-transmitting portion have the same thickness, and the first light-transmitting portion and the second light-transmitting portion are arranged at an interval.

[0011] Optionally, the light-transmitting portion also includes a third light-transmitting portion and a fourth light-transmitting portion, wherein the third light-transmitting portion and the fourth light-transmitting portion are spaced apart between the first light-transmitting portion and the second light-transmitting portion, and the thickness of the third light-transmitting portion and the fourth light-transmitting portion is smaller than the thickness of the first light-transmitting portion and the second light-transmitting portion.

[0012] Optionally, one side of the third light-transmitting portion and the fourth light-transmitting portion is connected to the reflecting portion, and the other side extends toward the planar portion; the height of the third light-transmitting portion and the fourth light-transmitting portion is smaller than the height of the first light-transmitting portion and the second light-transmitting portion.

[0013] Optionally, a plurality of prism structures are provided on the light-transmitting portion, and the plurality of prism structures are arranged along the side surface of the light-transmitting portion, from the light board toward the planar portion.

[0014] Optionally, the light-transmitting portion includes a first sub-light-transmitting portion, a second sub-light-transmitting portion and a third sub-light-transmitting portion, the second sub-light-transmitting portion is arranged between the first sub-light-transmitting portion and the third sub-light-transmitting portion, and is respectively interconnected with adjacent side surfaces of the first sub-light-transmitting portion and the third sub-light-transmitting portion; the first sub-light-transmitting portion and the third sub-light-transmitting portion have the same refractive index, and the refractive index of the second sub-light-transmitting portion is greater than the refractive index of the first sub-light-transmitting portion and the third sub-light-transmitting portion.

[0015] The present application also discloses a display device, including a display panel. The display device also includes the above-mentioned backlight module, and the backlight module is arranged on the light incident side of the display panel.

[0016] The present application improves the structure of the diffusion plate, and improves the original diffusion plate with only a single structure into a diffusion plate with two structures, a plane part and a retaining wall. The plane part is the component that mainly performs the function of the diffusion plate, so that the light is refracted, reflected, and scattered in different directions, thereby changing the path of the light, and achieving full dispersion of the incident light to produce an optical diffusion effect; when the diffusion plate is placed above the light board, the retaining wall is in contact with the light board, and the retaining wall stands on the light board to form a support for the plane part. After the multiple retaining walls support the originally thin plane part from multiple different positions, it is effectively prevented that a large area of ​​the plane part is suspended in the air and falls down, so that the plane part does not It is easy to deform; and when the display panel is zoned and dimmed, the light of the light-emitting unit in the working state is emitted from bottom to top and diverges in a fan shape. Therefore, a part of the divergent light emitted by the light-emitting unit in the working state is reflected back to the light-emitting area by the reflective part located at the lower part of the baffle wall, thereby enhancing the brightness of the light-emitting area. At the same time, a part of the light emitted toward the light-transmitting part is refracted after passing through the light-transmitting part because the light-transmitting part itself has a certain thickness, and the light moves closer to the light-emitting area, further improving the brightness of the light-emitting area and reducing the halo, effectively improving the problem of light loss in the light-emitting area due to the diffusion of light from the light-emitting area of ​​the lamp board to the non-light-emitting area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0018] Figure 1 This is a partial schematic diagram of the first embodiment of the backlight module of the present application;

[0019] Figure 2 It is a partial schematic diagram of a second embodiment of the backlight module of the present application;

[0020] Figure 3 This is a partial schematic diagram of a third embodiment of the backlight module of the present application;

[0021] Figure 4 A partial schematic diagram of a fourth embodiment of the backlight module of the present application;

[0022] Figure 5 This is a partial schematic diagram of a fifth embodiment of the backlight module of the present application;

[0023] Figure 6 This is a partial schematic diagram of a sixth embodiment of the backlight module of the present application;

[0024] Figure 7 This is a partial schematic diagram of a seventh embodiment of the backlight module of the present application;

[0025] Figure 8 This is a partial schematic diagram of an eighth embodiment of the backlight module of the present application;

[0026] Fig. 9 This is a partial schematic diagram of a ninth embodiment of the backlight module of the present application;

[0027] Fig.10 A top view of a tenth embodiment of the backlight module of the present application;

[0028] Fig.11 A top view of the eleventh embodiment of the backlight module of the present application;

[0029] Fig.12 It is a schematic diagram of an embodiment of a display device of the present application.

[0030] Among them, 10, display device; 100, backlight module; 200, display panel; 110, lamp board; 111, light-emitting unit; 112, auxiliary light-emitting unit; 120, diffusion plate; 121, plane part; 122, retaining wall; 123, reflecting part; 124, accommodating groove; 125, light-transmitting part; 126, first light-transmitting part; 127, second light-transmitting part; 128, third light-transmitting part; 129, fourth light-transmitting part; 130, first sub-light-transmitting part; 131, second sub-light-transmitting part; 132, third sub-light-transmitting part; 140, first retaining wall; 141, second retaining wall; 142, third retaining wall; 143, fourth retaining wall; 150, prism structure; 160, reflecting layer; 170, slot; 180, light-emitting area. DETAILED DESCRIPTION

[0031] The present application is described in detail below with reference to the accompanying drawings and optional embodiments. It should be noted that, under the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] Figure 1 This is a partial schematic diagram of the first embodiment of the backlight module of the present application. Figure 1As shown, the present application discloses a backlight module 100, including a lamp board 110, on which a plurality of light-emitting units 111 are arranged at intervals, and the backlight module 100 also includes a diffuser 120, the diffuser 120 is arranged at a position corresponding to the lamp board 110 on the light-emitting surface side of the lamp board 110, the diffuser 120 includes a plurality of baffles 122 and a flat portion 121, the flat portion 121 is arranged parallel to the lamp board 110, and the plurality of baffles 122 are arranged at intervals on a side of the flat portion 121 close to the lamp board 110, and the baffles 122 are arranged on a side of the flat portion 121 close to the lamp board 110. The wall 122 is perpendicular to the plane portion 121, the height of the retaining wall 122 is equal to the distance between the plane portion 121 and the light board 110, and each retaining wall 122 is set corresponding to the gap between two adjacent light-emitting units 111; the retaining wall 122 includes a reflective portion 123 and a light-transmitting portion 125, one side of the light-transmitting portion 125 is connected to the plane portion 121, and the other side is connected to one side of the reflective portion 123, and the other side of the reflective portion 123 abuts against the light board 110; the height of the light-transmitting portion 125 is less than the height of the reflective portion 123.

[0033] The present application improves the structure of the diffuser 120, and improves the diffuser 120, which originally had only a single structure, into a diffuser 120 having two structures, a plane portion 121 and a retaining wall 122. The plane portion 121 is a component that mainly performs the function of the diffuser 120, so that the light is refracted, reflected, and scattered in different directions, thereby changing the path of the light, and achieving full dispersion of the incident light to produce an optical diffusion effect; when the diffuser 120 is placed above the lamp board 110, the retaining wall 122 abuts against the lamp board 110, and the retaining wall 122 stands on the lamp board 110 to form a support for the plane portion 121. After the plurality of retaining walls 122 support the originally thin plane portion 121 from a plurality of different positions, it is effectively prevented that a large area of ​​the plane portion 121 is suspended in the air and falls down, so that the plane portion 121 is Part 121 is not easy to deform; and when the display panel 200 performs zone dimming, the light of the light-emitting unit 111 in the working state is emitted from bottom to top and diverges in a fan shape. Therefore, a part of the divergent light emitted by the light-emitting unit 111 in the working state is reflected back to the light-emitting area 180 by the reflecting part 123 located at the lower part of the baffle 122, thereby enhancing the brightness of the light-emitting area 180. At the same time, a part of the light emitted toward the light-transmitting part 125 is refracted after passing through the light-transmitting part 125 because the light-transmitting part 125 itself has a certain thickness, and the light moves closer to the light-emitting area 180, further improving the brightness of the light-emitting area 180 and reducing the halo, effectively improving the problem of light loss in the light-emitting area 180 due to the diffusion of light from the light-emitting area 180 of the lamp board 110 to the non-light-emitting area.

[0034] Further, such as Figure 1As shown, the reflective portion 123 is made of reflective material, and the height of the reflective portion 123 is less than the distance between the plane portion 121 and the light board 110 , and is greater than or equal to two-thirds of the distance between the plane portion 121 and the light board 110 .

[0035] Since when the display panel 200 performs zone dimming, the light of the working light-emitting unit 111 is emitted from bottom to top and diverges in a fan shape, the lower part of the baffle wall 122 is the part that is most likely to be penetrated by the light and continue to diverge. Therefore, the height of the reflecting portion 123 is greater than two-thirds of the distance between the planar portion 121 and the light board 110, so that the reflecting portion 123 can reflect most of the light diverged from the light-emitting unit 111 to the non-luminous area from the lower part of the baffle wall 122 back to the light-emitting area 180, thereby improving the brightness of the light-emitting area 180, and effectively improving the problem of light loss in the light-emitting area 180 due to the diffusion of light from the light-emitting area 180 of the light board 110 to the non-luminous area.

[0036] like Figure 1 As shown, the baffle wall 122 is formed by the plane portion 121 protruding toward the light board 110, and is integrally formed with the plane portion 121, so that the baffle wall 122 is not easy to fall off from the plane portion 121, thereby enhancing the service life of the baffle wall 122 and improving the structural stability of the diffuser plate 120, so that the baffle wall 122 can continuously reflect and refract the divergent light to reduce light loss, thereby further improving the display quality of the display panel 200; of course, the baffle wall 122 and the plane portion 121 can also be detachably fixed, and the present application does not impose any specific restrictions on the connection method of the baffle wall 122 and the plane portion 121. In this embodiment, only the baffle wall 122 and the plane portion 121 are integrally formed as an example for illustration.

[0037] Figure 2 FIG. 1 is a partial schematic diagram of a second embodiment of the backlight module of the present application. Figure 2 As shown, Figure 2 The illustrated embodiment is based on Figure 1 The improvement is that the width of the light-transmitting portion 125 in the horizontal direction is smaller than the width of the reflecting portion 123 in the horizontal direction; a plurality of prism structures 150 are arranged at the position of the planar portion 121 corresponding to the reflecting portion 123, and the plurality of prism structures 150 are respectively located on both sides of the light-transmitting portion 125, and the total width of the plurality of prism structures 150 and the light-transmitting portion 125 in the horizontal direction is smaller than or equal to the width of the reflecting portion 123 in the horizontal direction.

[0038] This embodiment and Figure 1 The difference between the illustrated embodiments is that the width of the light-transmitting portion 125 in this embodiment is smaller than the width of the reflective portion 123 , so that the retaining wall 122 as a whole forms a structure that is smaller at the top and larger at the bottom, and a plurality of prism structures 150 are arranged on the plane portion 121 corresponding to the portion where the reflective portion 123 is larger than the light-transmitting portion 125 .

[0039] When the light of the working light emitting unit 111 is emitted from bottom to top, a part of the light will first be reflected by the reflective portion 123 located at the lower part of the baffle 122, and the light irradiated on the reflective portion 123 will be reflected back to the light emitting area 180, thereby improving the brightness of the light emitting area 180. Another part of the light will be irradiated on the prism structure 150 close to the light emitting area 180, and the light diffused toward the non-light emitting area will be adjusted by refraction and reflection of the prism structure 150, so that the light will converge toward the light emitting area 180. Another part of the light will pass through the light-transmitting portion 125 and irradiate the area far from the light emitting area 180. On the prism structure 150, light will be refracted when passing through the light-transmitting portion 125, so that the position where the light is emitted is higher than the original position where it was incident, and closer to the light-emitting area 180. When the light is irradiated on the prism structure 150, it will be reflected and refracted multiple times by the prism structure 150, so that part of the light is re-injected into the light-transmitting portion 125, and is emitted from the light-transmitting portion 125 and returns to the light-emitting area 180, thereby further enhancing the brightness of the light-emitting area 180. This effectively improves the problem of light loss in the light-emitting area 180 caused by the light of the light board 110 diffusing to the non-light-emitting area.

[0040] Figure 3 FIG. 1 is a partial schematic diagram of a third embodiment of the backlight module of the present application. Figure 3 As shown, Figure 3 The illustrated embodiment is based on Figure 1 The improvement is that the reflecting part 123 is made of a transparent material, and the outer side surface of the reflecting part 123 is covered with a reflecting layer 160. The lamp board 110 also includes a plurality of auxiliary light-emitting units 112. The auxiliary light-emitting unit 112 is arranged between two adjacent light-emitting units 111, and the position of the auxiliary light-emitting unit 112 corresponds to that of the reflecting part 123. A receiving groove 124 is arranged on one side of the reflecting part 123 close to the lamp board 110, and the auxiliary light-emitting unit 112 is embedded in the receiving groove 124.

[0041] This embodiment and Figure 1 What is different from the illustrated embodiment is that, in this embodiment, the reflecting part 123 itself is made of a transparent material, and a reflecting layer 160 is wrapped on the outer surface of the reflecting part 123, so that the reflecting part 123 as a whole has a reflective effect; in addition, an auxiliary light-emitting unit 112 is additionally designed in this embodiment, and the auxiliary light-emitting unit 112 is arranged directly below the reflecting part 123. When the diffuser plate 120 is installed on the lamp board 110, the auxiliary light-emitting unit 112 is embedded through the accommodating groove 124 of the reflecting part 123 and abuts against the lamp board 110.

[0042] When the light of the working light-emitting unit 111 is emitted from bottom to top, a part of the light will first be reflected by the reflective layer 160 outside the reflective part 123 located at the lower part of the baffle 122, and the light irradiated on the reflective layer 160 outside the reflective part 123 will be reflected back to the light-emitting area 180, thereby improving the brightness of the light-emitting area 180; and the light emitted by the auxiliary light-emitting unit 112 located in the accommodating groove 124 will irradiate the inside of the reflective part 123, and the light will diffuse outward from the inside of the reflective part 123. Since the reflective layer 160 is arranged outside the reflective part 123, the light irradiated inside the reflective part 123 will be continuously reflected by the reflective layer 160 outside the reflective part 123, and will be gathered to the light-transmitting part 125, and finally emitted from the light-transmitting part 125. This can not only enhance the brightness of the light-emitting area 180 and reduce the light loss, but also reduce the dark grid stripes and halo phenomenon formed by the baffle 122.

[0043] In addition, in this embodiment, an auxiliary light-emitting unit 112 is provided at a position of the light board 110 corresponding to the reflecting portion 123, and when the diffuser plate 120 is installed on the light board 110, the receiving groove 124 of the reflecting portion 123 can be snapped onto the auxiliary light-emitting unit 112 to form a fitting fixation. Since the retaining wall 122 and the plane portion 121 are integrally formed, a fixation between the entire diffuser plate 120 and the light board 110 is formed, thereby improving the installation stability of the diffuser plate 120 and facilitating the quick assembly of the diffuser plate 120 and the light board 110.

[0044] Figure 4 FIG. 4 is a partial schematic diagram of a fourth embodiment of the backlight module of the present application. Figure 4 As shown, the light-transmitting portion 125 includes a first light-transmitting portion 126 and a second light-transmitting portion 127 . The first light-transmitting portion 126 and the second light-transmitting portion 127 have the same thickness and are spaced apart from each other.

[0045] The present embodiment is different from the previous embodiment in that the light-transmitting portion 125 in the present embodiment includes two parts, namely, a first light-transmitting portion 126 and a second light-transmitting portion 127, and one side of the first light-transmitting portion 126 and the second light-transmitting portion is connected to the plane portion 121, and the other side is connected to the reflecting portion 123 to form a complete diffuser 120. When light is emitted from the light-emitting unit 111, since the light is diverged from bottom to top, part of the light diverging toward the non-light-emitting area will be reflected back to the light-emitting area 180 by the reflecting portion 123 located at the bottom, thereby increasing the brightness of the light-emitting area 180; and the other side of the light-transmitting portion 125 is connected to the plane portion 121 and the reflecting portion 123. When passing through the light-transmitting portion 125, a portion of the light will first enter the first light-transmitting portion 126, then be emitted from the first light-transmitting portion 126, enter the air between the first light-transmitting portion 126 and the second light-transmitting portion 127, and then be emitted from the second light-transmitting portion 127 from the air. That is, the light undergoes multiple refractions when passing through the first light-transmitting portion 126 and the second light-transmitting portion 127, which changes the path on which the light is finally emitted, converges the light toward the direction of the light-emitting area 180, and reduces the area where the halo is generated, thereby effectively improving the display effect of the display panel 200.

[0046] Figure 5 FIG. 1 is a partial schematic diagram of a fifth embodiment of the backlight module of the present application. Figure 5 As shown, Figure 5 The illustrated embodiment is based on Figure 4 The improvement is that the light-transmitting portion 125 also includes a third light-transmitting portion 128 and a fourth light-transmitting portion 129, and the third light-transmitting portion 128 and the fourth light-transmitting portion 129 are arranged between the first light-transmitting portion 126 and the second light-transmitting portion 127, and the thickness of the third light-transmitting portion 128 and the fourth light-transmitting portion 129 is less than the thickness of the first light-transmitting portion 126 and the second light-transmitting portion 127.

[0047] The present embodiment is different from the previous embodiment in that, in the present embodiment, since the third light-transmitting portion 128 and the fourth light-transmitting portion 129 are arranged between the first light-transmitting portion 126 and the second light-transmitting portion 127, and the air between the third light-transmitting portion 128 and the fourth light-transmitting portion 129 will also refract the light, in order to ensure that the light finally emitted can approach the light-emitting area 180, the thickness of the third light-transmitting portion 128 and the fourth light-transmitting portion 129 located in the middle is smaller than that of the first light-transmitting portion 126 and the second light-transmitting portion 127. When the materials are the same, the refractive index of the third light-transmitting portion 128 and the fourth light-transmitting portion 129 is smaller than the refractive index of the first light-transmitting portion 126 and the second light-transmitting portion 127, so that when the light passes through the third light-transmitting portion 128, the fourth light-transmitting portion 129 and the air, most of the light can finally be emitted into the second light-transmitting portion 127 to form the final refraction.

[0048] When light is incident toward the light-transmitting portion 125, it will first pass through the first light-transmitting portion 126, and then pass through the third light-transmitting portion 128 and the fourth light-transmitting portion 129 in sequence, and finally be emitted from the second light-transmitting portion 127. At this time, the light is refracted through the four light-transmitting portions 125 and the air between two adjacent light-transmitting portions 125, which changes the refraction angle of the light multiple times, continuously raises the position where the light is emitted, changes the final emission path of the light, and brings the light closer to the luminous area 180. While converging the light in the direction of the luminous area 180, the area where the halo is generated is reduced, thereby effectively improving the display effect of the display panel 200.

[0049] Figure 6 FIG. 1 is a partial schematic diagram of a sixth embodiment of the backlight module of the present application. Figure 6 As shown, Figure 6 The illustrated embodiment is based on Figure 5 The improvement is that one side of the third light-transmitting portion 128 and the fourth light-transmitting portion 129 is connected to the reflecting portion 123, and the other side extends toward the direction of the planar portion 121; the height of the third light-transmitting portion 128 and the fourth light-transmitting portion 129 is less than the height of the first light-transmitting portion 126 and the second light-transmitting portion 127.

[0050] Different from the previous embodiment, the third light-transmitting portion 128 and the fourth light-transmitting portion 129 in this embodiment are fixedly connected to the reflecting portion 123, and the heights of the third light-transmitting portion 128 and the fourth light-transmitting portion 129 are shorter than the first light-transmitting portion 126 and the second light-transmitting portion 127, so that only the first light-transmitting portion 126 and the second light-transmitting portion 127 are in contact with the planar portion 121, so that the area where the planar portion 121 actually contacts the light-transmitting portion 125 becomes smaller, and when the planar portion 121 is subjected to pressure, the probability of damage to the planar portion 121 can be reduced.

[0051] Furthermore, in order to avoid light loss in the light-emitting area 180 after the light passes through the light-transmitting portion 125, the present application also improves the structure of the retaining wall 122, and specifically improves the light-transmitting portion 125, as follows:

[0052] Figure 7 FIG. 1 is a partial schematic diagram of a seventh embodiment of the backlight module of the present application. Figure 7 As shown, a plurality of prism structures 150 are disposed on the light-transmitting portion 125 , and the plurality of prism structures 150 are arranged along the side surface of the light-transmitting portion 125 , from the light board 110 to the planar portion 121 .

[0053] This embodiment and Figure 1What is different from the illustrated embodiment is that, in this embodiment, a plurality of prism structures 150 are arranged on the side of the light-transmitting portion 125. The plurality of prism structures 150 refract and reflect the light irradiated onto the light-transmitting portion 125 multiple times, thereby changing the original propagation path of the light and making the light converge in the direction directly opposite to the light-emitting area 180. This can effectively improve the light loss in the light-emitting area 180 caused by the light passing through the light-transmitting portion 125, further enhance the brightness of the light-emitting area 180 in the bright state, and improve the display quality of the display panel 200.

[0054] Figure 8 FIG. 8 is a partial schematic diagram of an eighth embodiment of the backlight module of the present application. Figure 8 As shown, Figure 8 The illustrated embodiment is based on Figure 1 The improvement is as follows: the light-transmitting portion 125 includes a first sub-light-transmitting portion 130, a second sub-light-transmitting portion 131 and a third sub-light-transmitting portion 132, the second sub-light-transmitting portion 131 is arranged between the first sub-light-transmitting portion 130 and the third sub-light-transmitting portion 132, and is respectively interconnected with adjacent side surfaces of the first sub-light-transmitting portion 130 and the third sub-light-transmitting portion 132; the refractive index of the first sub-light-transmitting portion 130 and the third sub-light-transmitting portion 132 is the same, and the refractive index of the second sub-light-transmitting portion 131 is greater than the refractive index of the first sub-light-transmitting portion 130 and the third sub-light-transmitting portion 132.

[0055] This embodiment and Figure 1 What is different from the illustrated embodiment is that in this embodiment, the light-transmitting portion 125 includes three parts: a first sub-light-transmitting portion 130, a second sub-light-transmitting portion 131 and a third light-transmitting portion 128. The three sub-light-transmitting portions 125 are arranged side by side in sequence and their side walls are connected to each other to form a complete light-transmitting portion 125.

[0056] When light enters from the side of the first sub-light-transmitting portion 130, it will first pass through the first sub-light-transmitting portion 130 to form a first refraction, and the position where the light is emitted is higher than the position when it first enters. When the light passes through the first sub-light-transmitting portion 130 and enters the second sub-light-transmitting portion 131, a second refraction is formed. Since the refractive index of the second sub-light-transmitting portion 131 is greater than the refractive index of the first sub-light-transmitting portion 130, the second sub-light-transmitting portion 131 will further raise the position where the light is emitted, so that the light is more inclined to move closer to the light-emitting area 180. When the light enters the third sub-light-transmitting portion 132 through the second sub-light-transmitting portion 131, a third refraction is formed. When the light finally passes through the third sub-light-transmitting portion 132, it will be more inclined to the light-emitting area 180, and converge at a position near the light-emitting area 180, further improving the brightness of the light-emitting area 180 and reducing the halo, effectively improving the problem of light loss and insufficient brightness caused by the light emitted from the light-emitting area 180 diffusing to the non-light-emitting area.

[0057] Of course, when light enters from the side of the third sub-light-transmitting portion 132, it will experience entering from the third sub-light-transmitting portion 132, adjusting the refraction angle through the second sub-light-transmitting portion 131, and finally being emitted from the first sub-light-transmitting portion 130, achieving the same effect as the above scheme. Due to space limitations, they will not be elaborated one by one.

[0058] Fig. 9 FIG. 1 is a partial schematic diagram of a ninth embodiment of the backlight module of the present application. Fig. 9 As shown, Fig. 9 The illustrated embodiment is based on Figure 1 In an improvement, a plurality of slots 170 are provided on one side of the plane portion 121 close to the lamp board 110 , and each retaining wall 122 is inserted into the slot 170 and has an interference fit with the slot 170 ; the number of retaining walls 122 is less than or equal to the number of slots 170 .

[0059] This embodiment and Figure 1 What is different from the illustrated embodiment is that, in this embodiment, the planar portion 121 and the retaining wall 122 of the diffuser plate 120 are detachable structures. During the actual installation process, a plurality of retaining walls 122 can be first inserted one by one into the slots 170 of the planar portion 121. Through the interference fit between the retaining walls 122 and the slots 170, the retaining walls 122 are fixed in the slots 170 and are not easy to fall off. Then, the installed diffuser plate 120 is placed on the lamp panel 110 for assembly.

[0060] During use, when a partially damaged retaining wall 122 needs to be replaced, only the retaining wall 122 can be replaced without replacing the entire diffusion plate 120, which makes maintenance more convenient and saves material costs.

[0061] In addition, since each light-emitting unit 111 in the Mini LED light board 110 can emit light or not, the light emitted by each light-emitting unit 111 in the working state may diffuse toward the adjacent non-working light-emitting unit 111, causing light loss. Therefore, in order to further prevent the light from diffusing between each light-emitting unit 111 and causing the influence of light loss, the arrangement of the retaining wall 122 in this embodiment is improved as follows:

[0062] Fig.10 FIG. 1 is a top view of the tenth embodiment of the backlight module of the present application. Fig.10 As shown, the multiple retaining walls 122 include a first retaining wall 140, a second retaining wall 141, a third retaining wall 142 and a fourth retaining wall 143 connected end to end, and each light-emitting unit 111 is located in the area enclosed by the first retaining wall 140, the second retaining wall 141, the third retaining wall 142 and the fourth retaining wall 143.

[0063] like Fig.10As shown, a first baffle wall 140, a second baffle wall 141, a third baffle wall 142 and a fourth baffle wall 143 which are connected end to end in sequence form a U-shaped structure. When the diffuser plate 120 is placed above the lamp board 110, each light-emitting unit 111 is located in the U-shaped structure, and each light-emitting unit 111 is surrounded by four baffle walls 122 to form a "point focus" so that the light emitted by the light-emitting unit 111 cannot diffuse around, but is re-reflected by the reflective portion 123 back to the light-emitting area 180 formed by the single light-emitting unit 111, thereby enhancing the brightness of each light-emitting unit 111. At the same time, a part of the light is refracted by the surrounding light-transmitting portions 125, so that the light moves closer to the light-emitting area 180 formed by each light-emitting unit 111, further improving the brightness of the light-emitting unit 111 and reducing the halo, effectively improving the problem of light loss and insufficient brightness of the single light-emitting unit 111 caused by the light emitted by the single light-emitting unit 111 in the working state diffusing to the light-emitting unit 111 in the non-working state.

[0064] Of course, the shape formed by the first retaining wall 140, the second retaining wall 141, the third retaining wall 142 and the fourth retaining wall 143 is not necessarily a U-shape, but can also be other shapes, such as a rhombus, a parallelogram, etc., which can also achieve the above-mentioned effects. Due to space limitations, they will not be described one by one. This application only takes the U-shaped structure formed by the first retaining wall 140, the second retaining wall 141, the third retaining wall 142 and the fourth retaining wall 143 as an example for illustration.

[0065] Fig.11 is a top view of the eleventh embodiment of the backlight module of the present application, as shown Fig.11 As shown, at least two adjacent light-emitting units 111 form a light-emitting area 180 , and a plurality of retaining walls 122 are arranged around the light-emitting area 180 .

[0066] This embodiment is different from the previous embodiment in that, in this embodiment, a plurality of baffles 122 are used to converge and gather light in a light-emitting area 180 composed of at least two adjacent light-emitting units 111, forming "surface focusing". This can effectively reduce the number of baffles 122 and save costs. At the same time, it can effectively avoid the phenomenon of dark grid stripes and halo appearing on the display due to the excessive density of the baffles 122, thereby further optimizing the display effect.

[0067] like Fig.11As shown, when four adjacent light-emitting units 111 emit light together to form a light-emitting area 180, the brightness formed is more obvious, and the regional light formed by the four light-emitting units 111 diffuses to the surrounding non-luminous area 180, and the phenomenon of light loss is also more obvious. In this embodiment, the light-emitting area 180 composed of four adjacent light-emitting units 111 is surrounded by multiple retaining walls 122, which can prevent the regional light emitted by the four light-emitting units 111 from diffusing to the surrounding non-luminous area and causing obvious light interference. At the same time, the light is reflected in an enclosing manner, and the original path of the light diffusing toward the non-luminous area is changed, so that the light is reflected back to the light-emitting area 180, thereby enhancing the brightness of the light-emitting area 180; at the same time, a part of the light is refracted by the surrounding light-transmitting parts 125, so that the light as a whole moves closer to the light-emitting area 180, further improving the brightness of the light-emitting area 180, reducing the halo, and effectively improving the problem of light loss in the light-emitting area 180 caused by the light diffusing from the light-emitting area 180 of the lamp board 110 to the non-luminous area.

[0068] It should be noted that, in this embodiment, the number of retaining walls 122 and the shape they form are determined according to the number of light-emitting units 111 that form the light-emitting area 180. For example, when the number of light-emitting units 111 in the light-emitting area 180 is two, the number of retaining walls 122 surrounding the light-emitting area 180 may be four, forming a U-shape; when the number of light-emitting units 111 in the light-emitting area 180 is three, the number of retaining walls 122 surrounding the light-emitting area 180 may be three, forming a triangle; this embodiment only takes the case where the number of light-emitting units 111 in the light-emitting area 180 is two, and the number of retaining walls 122 surrounding the light-emitting area 180 is four, and they form a U-shape as an example.

[0069] Fig.12 is a schematic diagram of an embodiment of a display device of the present application, such as Fig.12 As shown, the present application also includes a display device 10 , including a display panel 200 . The display device 10 also includes the above-mentioned backlight module 100 . The backlight module 100 is arranged on the light incident side of the display panel 200 .

[0070] The display panel 200 does not emit light by itself, and the backlight module 100 is required to provide a light source for the display panel 200 to emit light normally. The backlight module 100 is set on one side of the light incident surface of the display panel 200 so that the light emitted by the backlight module 100 can pass through the display panel 200, so that the display panel 200 can display normally.

[0071] In the Mini LED backlight module 100, since a zone dimming method is adopted, a plurality of light-emitting units 111 on the lamp board 110 in the backlight module 100 are partially in a working state to form a light-emitting area 180, and partially in a non-working state to form a non-light-emitting area according to actual needs. However, since the working light-emitting units 111 and the non-working light-emitting units 111 are closely spaced, the light in the light-emitting area 180 will diffuse to the non-light-emitting area 180, resulting in light loss in the light-emitting area 180.

[0072] Based on the above problems, the present application improves the backlight module 100 in the display device 10, and specifically improves the structure of the diffusion plate 120 in the backlight module 100. The diffusion plate 120 originally having only a single structure is improved to a diffusion plate 120 having two structures, a plane portion 121 and a retaining wall 122. When the diffusion plate is placed above the lamp board 110, the retaining wall 122 abuts against the lamp board 110 to form a support, effectively preventing the diffusion plate 120 from being suspended in a large area and falling down, so that the diffusion plate 120 is not easily deformed, and the retaining wall 122 separates two adjacent light-emitting elements on the lamp board 110. When the display panel 200 performs zone dimming, the light of the light-emitting unit 111 in the working state is emitted from the bottom to the top. Therefore, a part of the divergent light emitted by the light-emitting unit 111 in the working state is reflected back to the light-emitting area 180 by the reflecting part 123 located at the lower part of the baffle 122, thereby enhancing the brightness of the light-emitting area 180. At the same time, a part of the light is refracted after passing through the light-transmitting part 125, and the light moves closer to the light-emitting area 180, further improving the brightness of the light-emitting area 180 and reducing the halo, effectively improving the problem of light loss in the light-emitting area 180 due to the diffusion of light from the light-emitting area 180 of the lamp board 110 to the non-light-emitting area.

[0073] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[0074] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A backlight module, comprising a light board, on which a plurality of light-emitting units are arranged at intervals, characterized in that: The backlight module also includes a diffusion plate, the diffusion plate is arranged at the light emitting surface side of the light board corresponding to the position of the light board, the diffusion plate includes a plurality of baffles and a plane portion, the plane portion is arranged parallel to the light board, a plurality of baffles are arranged at intervals on a side of the plane portion close to the light board, the baffles are perpendicular to the plane portion, the height of the baffles is equal to the distance between the plane portion and the light board, and each of the baffles is arranged corresponding to the gap between two adjacent light emitting units; The baffle wall comprises a reflective portion and a light-transmitting portion, one side of the light-transmitting portion is connected to the planar portion, the other side of the light-transmitting portion is connected to one side of the reflective portion, and the other side of the reflective portion abuts against the light board; the height of the light-transmitting portion is less than the height of the reflective portion; The width of the light-transmitting portion in the horizontal direction is smaller than the width of the reflecting portion in the horizontal direction; A plurality of prism structures are arranged at a position of the planar portion corresponding to the reflective portion, the plurality of prism structures are respectively located on both sides of the light-transmitting portion, and a total width of the plurality of prism structures and the light-transmitting portion in a horizontal direction is less than or equal to a width of the reflective portion in a horizontal direction; The light diffused toward the non-luminous area is adjusted by refraction and reflection of the prism structure so that the light converges toward the luminous area. A portion of the light passes through the light-transmitting portion and shines on the prism structure away from the luminous area, and is emitted from the light-transmitting portion and returns to the luminous area.

2. The backlight module according to claim 1, characterized in that: The reflective portion is made of reflective material, and the height of the reflective portion is less than the distance between the plane portion and the light board, and is greater than or equal to two-thirds of the distance between the plane portion and the light board.

3. A backlight module, characterized in that: The backlight module further comprises a diffuser, the diffuser corresponding to the position of the light board is arranged on the light emitting surface side of the light board, the diffuser comprises a plurality of baffles and a plane part, the plane part is arranged parallel to the light board, a plurality of baffles are arranged at intervals on a side of the plane part close to the light board, the baffles are perpendicular to the plane part, the height of the baffles is equal to the distance between the plane part and the light board, and each baffle is arranged corresponding to the gap between two adjacent light emitting units; The baffle wall comprises a reflective portion and a light-transmitting portion, one side of the light-transmitting portion is connected to the planar portion, the other side of the light-transmitting portion is connected to one side of the reflective portion, and the other side of the reflective portion abuts against the light board; the height of the light-transmitting portion is less than the height of the reflective portion; The reflective part is made of a transparent material, and the outer side of the reflective part is covered with a reflective layer. The light board also includes a plurality of auxiliary light-emitting units, and the auxiliary light-emitting units are arranged between two adjacent light-emitting units, and the positions of the auxiliary light-emitting units correspond to those of the reflective part; A receiving groove is arranged on one side of the reflecting part close to the light board, and the auxiliary light emitting unit is embedded in the receiving groove.

4. A backlight module, characterized in that: The backlight module further comprises a diffuser, the diffuser corresponding to the position of the light board is arranged on the light emitting surface side of the light board, the diffuser comprises a plurality of baffles and a plane part, the plane part is arranged parallel to the light board, a plurality of baffles are arranged at intervals on a side of the plane part close to the light board, the baffles are perpendicular to the plane part, the height of the baffles is equal to the distance between the plane part and the light board, and each baffle is arranged corresponding to the gap between two adjacent light emitting units; The baffle wall comprises a reflective portion and a light-transmitting portion, one side of the light-transmitting portion is connected to the planar portion, the other side of the light-transmitting portion is connected to one side of the reflective portion, and the other side of the reflective portion abuts against the light board; the height of the light-transmitting portion is less than the height of the reflective portion; The light-transmitting portion includes a first light-transmitting portion and a second light-transmitting portion. The first light-transmitting portion and the second light-transmitting portion have the same thickness, and the first light-transmitting portion and the second light-transmitting portion are arranged at an interval.

5. The backlight module according to claim 4, characterized in that: The light-transmitting portion further includes a third light-transmitting portion and a fourth light-transmitting portion, The third light-transmitting portion and the fourth light-transmitting portion are spaced apart between the first light-transmitting portion and the second light-transmitting portion, and thicknesses of the third light-transmitting portion and the fourth light-transmitting portion are smaller than thicknesses of the first light-transmitting portion and the second light-transmitting portion.

6. The backlight module according to claim 5, characterized in that: One side of the third light-transmitting portion and the fourth light-transmitting portion is connected to the reflecting portion, and the other side extends toward the planar portion; the height of the third light-transmitting portion and the fourth light-transmitting portion is smaller than the height of the first light-transmitting portion and the second light-transmitting portion.

7. A backlight module, characterized in that: The backlight module further comprises a diffuser, the diffuser corresponding to the position of the light board is arranged on the light emitting surface side of the light board, the diffuser comprises a plurality of baffles and a plane part, the plane part is arranged parallel to the light board, a plurality of baffles are arranged at intervals on a side of the plane part close to the light board, the baffles are perpendicular to the plane part, the height of the baffles is equal to the distance between the plane part and the light board, and each baffle is arranged corresponding to the gap between two adjacent light emitting units; The baffle wall comprises a reflective portion and a light-transmitting portion, one side of the light-transmitting portion is connected to the planar portion, the other side of the light-transmitting portion is connected to one side of the reflective portion, and the other side of the reflective portion abuts against the light board; the height of the light-transmitting portion is less than the height of the reflective portion; A plurality of prism structures are arranged on the light-transmitting portion, and the plurality of prism structures are arranged along the side surface of the light-transmitting portion, from the light board to the direction of the planar portion.

8. A backlight module, characterized in that: The backlight module further comprises a diffuser, the diffuser corresponding to the position of the light board is arranged on the light emitting surface side of the light board, the diffuser comprises a plurality of baffles and a plane part, the plane part is arranged parallel to the light board, a plurality of baffles are arranged at intervals on a side of the plane part close to the light board, the baffles are perpendicular to the plane part, the height of the baffles is equal to the distance between the plane part and the light board, and each baffle is arranged corresponding to the gap between two adjacent light emitting units; The baffle wall comprises a reflective portion and a light-transmitting portion, one side of the light-transmitting portion is connected to the planar portion, the other side of the light-transmitting portion is connected to one side of the reflective portion, and the other side of the reflective portion abuts against the light board; the height of the light-transmitting portion is less than the height of the reflective portion; The light-transmitting portion includes a first sub-light-transmitting portion, a second sub-light-transmitting portion and a third sub-light-transmitting portion, the second sub-light-transmitting portion is arranged between the first sub-light-transmitting portion and the third sub-light-transmitting portion, and is respectively interconnected with adjacent side surfaces of the first sub-light-transmitting portion and the third sub-light-transmitting portion; the first sub-light-transmitting portion and the third sub-light-transmitting portion have the same refractive index, and the refractive index of the second sub-light-transmitting portion is greater than the refractive index of the first sub-light-transmitting portion and the third sub-light-transmitting portion.

9. A display device, comprising a display panel, characterized in that: The display device further comprises a backlight module as claimed in any one of claims 1 to 8, wherein the backlight module is arranged on a light incident surface side of the display panel.

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